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Effusion-Serum Chloride Gradient in Heart Failure-Associated Pleural Effusion - Pathophysiologic Implications.
1Internal Medicine, Nishida Hospital Oita Japan.
Circulation Reports
|March 11, 2021
Summary
In heart failure (HF) patients with pleural effusion, chloride levels are higher in pleural fluid than serum. This suggests chloride plays a key role in fluid accumulation in the pleural space.
Area of Science:
- Cardiology
- Pulmonology
- Nephrology
Background:
- Limited clinical data exists on pleural fluid electrolyte analysis in heart failure (HF).
- Pleural effusion is a common complication of worsening HF, impacting patient management.
Purpose of the Study:
- To investigate electrolyte concentrations in pleural fluid of HF patients.
- To determine the relationship between serum and pleural fluid electrolytes in HF-associated pleural effusion.
Main Methods:
- Retrospective analysis of 17 patients with pleural effusion and HF.
- Thoracentesis for pleural fluid and blood samples within 2 hours.
- Biochemical analysis of electrolytes (chloride, sodium, potassium) and Light's criteria for effusion classification.
Main Results:
- Fifteen patients had HF-associated pleural effusion (10 transudative, 5 exudative).
- The effusion-serum chloride gradient was significantly higher (7.4±2.6 mEq/L) than sodium (0.9±1.4 mEq/L) and potassium (-0.1±0.3 mEq/L).
- Elevated chloride in pleural fluid suggests its role in fluid retention.
Conclusions:
- Chloride concentration is elevated in the pleural effusion of HF patients compared to serum.
- Chloride may play a significant role in the formation and retention of pleural fluid in heart failure.
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